Pole-changer.



W. W. DEAN.

POLE CHANGER.

APPLIUATION FILED 1120.27, 1910.

1,043,906,v Patutd Nov.1z,1912.

-2 Simms-SHEET 1.

` Fig 2 l ((21 I Wi'fnesses /flVflfOf' Zw A wil/fam w. Dean y Hfs.k A #omeff W. W. DEAN.

POLE CHANGER.

APPLICATION FILED DB0. 27, 1910.

2 SHEETS-SHEET 2.

/m/erzfor'v Will/'am W. -Dean Byj@ Hfs A I Patented Nov. 12,19'12.

[UNITED STATES PATENT OFFICE.

WILLIAM W. DEAN,

or ELYRIA, euro, AssIeNon To Tun DEAN ELECTRIC COMPANY, or ELYnIa, omo, A CORPORATION or onto.

POLE-CHANGER.

Speclcation of Letters Patent.

Patented Nov. 12, 1912.

Application le December 27, i910. Serial No. 599,521,

To all who/m it may concern:

Be it known that I, WILLIAM W, DEAN, a

.. citizen of the vUnited States, residing at Elyria in the countyv of Lorain .and State of Ohio, have invented' certain new and useful Improvements in Pole-Changers; and

I do hereby declare the following to be a full, clear, and exact description of my invention, such as will enable others skilled in the art to which it appertains to make and use the same.

' My invent-ion relates to that class ot polo changers whichare adapted to be used in harmonic party line signaling. In this class of work, several signals are placed upon the same line. These signals are to be selected and operated by current from current generating means in such a way as to operate a Y of fr uencies corresponding to that of the indivi ual reeds are placed -upon the line for thev purpose of selectively operating such reeds. When this system of selective signaling was first instituted, alternators were employed for the pur ose of generating the' operating current. bese yalternators reuired sources of power to ,drive them so t at they could not be used 'in small towns where such sources ofower were not 'avait l y able and where party` ine work in the telephone business was especially desirable. To -meet this demand, pole changers which could roduce such a current as 'would opcrate t iese signals were designed. The. pole changers f o'f the artwhich. were. employed to 'operate individual bells were found ill `adapted and practicallyunfit to produce a `frequency ofcurrent as was necessary select and operate the frequency signals. In commercial work, these 'signals are I'illr'iyed. on roughly constructed lines .under current of such uniformity with regard to to all sorts of weat ier .and conditions, with all sorts of people, for year after year,l

and s}; ecial`pole` changersto perform the @functions described-were fornitiltdkbe-necesf sary.r. Althoughthe diiferencestlie .l n

pole changers of the prior art and these specially desi Jed pole changers have been slight, those s ightY changes have determined a success where the old pole changers were failures..

My invention relates to a class of pole changers which are employed in this par;

ticular class of work and the object of my invention is the improvement of such poleI changers.

I' ann to produce an instrument more simple, both 1n construction and operatlon, re-

ducing the cost of production and of maintenance, and an instrument which will pro-4 duce a more levenly curved wave, such thatf' interference between the signaling will be less frequent. l aim to lessen the burden upon the'source of current and to lengthen the "period .during which the instrument will work without the attention of the trouble-i' man.

Other objectsvof my invent-ion will be ap parent from the particular description.

Hitherto, one of the contacts employed in this class of pole changers has been carried by al vibrating member. v This makes it necessary to connect the .sources of current through a member, one end of which is stationary and the other vibrating.- Thereisl always a joint between the vibrating member andthe means which connects it to the base which forms some resistanceto the curcontacts is' thus carredgkbythe vibrating niemberf which is a lfiexiblekreed vibrating with a.' fundamental `and several 'harmonics or vibrations of less4 amplitude 4than the fundamental, the .contacts incoming torent. This resistance naturally varies with the `conclitionof the joint. When one of the gether *will not strike witlra ,l ositive blow,

but owing to the harmonisfan #other causes, the engagement will be fof-ia vibratory nature. I-avoid these objectionnbl1.` features by mounting both the contacts upon a Ste.-v

tionary member, and operating the switch- .formed thereby,...l by thej yibratinginember which is independent of'tliecontacts. The contacts. ywhich control `the circuit.` o f the motor are .mounted upon the stationary member'inpnormally closed 'relation so that 'i immediately the switchis closed,. the system Awill begin tooperatel without it being necessaryito'fstelrtfthe reed' with the hand. These contacts .are-f likewiseimounted 4indeperlidently Ios of the reed avoiding the objections cited. The reed is operatedby a motor magnet. and in order to keep thereed vibrating at just the proper frequency, it is necessary to adjust this motor magnet in the begmnlng positions for different instruments, allowing for the variation in the personal characteristics of the ditterent reeds. As these characteristics change, it is necessary to adjust the normal air gap between the reed and magnet from time to time. To accom-- plish this, I make these magnets adjustable and further, make them individually adjustable. ln pole changers of this character which have heretofore been built, the struc.- ture has not been such that the magnets could he readily removed from the frame without disturbing the adjustments of the contacts or other parts of the pole changer. .Xs it is vnecessary from time to time to rcmove a coil or core, and as it is exceedingly inconvenient to disturb thc adjustment of the contacts, this feature of my invention is of considerable importance.

lnasn'iuchas in the System which I use, I employ a splitpriniary transformer with a circuit for each half of the primary, which is controlled by the pole changer, I employ 'two switches to be operated by the vibrating reed. These switches are operated alternately and in order to accomplish this, the reed is placed between the switches. Since in the device shown in the drawing the contacts of these switches are supported from the. hase by supports, it 'is convenient to stagger these supports so that. the contacts when attached thereto readily fall on either side ot the vibratory reed. One of the contacts of each switch is carried by a flexible member which has its own period of vibration and which is aptwhen it strikes the associate contact to strike with a vibratory contacting blow. To prevent this, I stiften the part of thr.` flexible member which carries the contact so that all the flexing is in another portion of this member. This likewise insures a positive break when the springs are separated, as the power which separates them is applied to :mother part of the tlexible member. and were the part which carries the Contact allowed to flex the contacts would be separated in much the same way that two sheets ot paper which are held together b v soft mucilagc are when pulled apart. In my pole cb: nger, the closing of the switch is made by the resilleiufy ot' the tlexible member itself and the separatm;` is caused b v the .'ibratory reed. rl`his insure-y a sharp and positive break without the employment. of spetzialfuiicaiis. 'l`o accomplish thisl in many of the pele changers of the prior art. a backing member associated with the spring is employed. It.

' will thus be seen thata positive engagement l such that the magnet will occupy different i @43,906 BEE-5T of the contacts is insured, owing to the elasticity of the spring and a positive break insured owing to the vibrator-y member, the y ment thereof. while the scope will be more particularly point-ed out in the appeiuled claims.

Figure l is a plan view of the 'ple/ changer. Fig. 2 is :1 front elevation of this instrument. Fig. 3 is a side elevation. kvFig. 4 is a section through the line .YW-X of Fig. l. Fig. 5 is :n persiwetive view of the flexible contact earl" .g member. A `section laken lin'ough line Y-Y o1 Fig. 5. Fig. i' is a diagrammatic view of the instrument and a circuit with which itniay be emploi-t d. This view is not aetually representative .of the mechanism :ls employed in the form ot' the invention as illustrated in the other tigures, but shows certain parts displaced.

Referring:` now to ther drawings, 'l is the base of my pole changer. Each corner of the base is pierced at 2. Screws or other fastening means (not shown) may be employedin connection with these openings to attach the hase to a table or other support.- Supports 3 and 4 are mounted upon thebase Fig. t'. is a in staggered relation to cach other, the supi port 4 being farther forward than the support 3.- A third support 5 rises from the rear of the base. vThe support 5 carri'esa holding member 6 which 1s removably fastened thereto. The member-b is removably mounted upon the support 5 in order that it may be removed therefrom when it is desired to change or to adjust the magnets. Screws 7 are employed for this purpose in the form shown. An insulating member 8 carrying contaQLs 9 is -fastened to the holding member bv suit-able fastening means, such as screws 10 and insulates the contacts from the other arts of the instrument." The holding mem er is bored outl at 11.

The motor magnets are shown at 19.-. These magnets consist ofja core 13, a spool 14' mounted on thecore and ,windings 15 mounted on the spool: The corey 13 projects at: one end beyond the'spool as shown at 16. This projection 16 is adapted to be inserted in the opening 11 of the holding member and held there by a set screw 17. The magnet, as will readilylbe seen is adjustable" 1n the opening .1l and is carried by the holdlng member 6. The screws 7 may be 'removed-and the holding member taken away with the magnets 'carried thereby without disturbing the other `partsof the apparatus. The otherfend o'thecore, whichi'l. will call the operating and, because it is this end ,4 and substantially in a plane vwith the opposite faces of the supports; I y part of this reed is cut away and a Weight 22 adinstably mounted thereon'and held 1n f osition by aset screw 23. The rate of viration of the reed may be changed by ad- *ffjusting this weight up and down thereed. "This reed carries an armature 24 which is fastened thereto by convenient fastening means, such as bolts 25. This armature, as will be seen, is mounted in such a position as to be directly in front of the operatin ends' ot the motor magnets.

' i i The support 3 carries a contact carrying member 3G which is insulated therefrom by insulation 3l. This member isastened to the support by convenient fastening means, such as screws 327 the said screws being insulated therefrom by a layer of insulation 33 and bushings (not shown). This member carries a terminal 34. `At 35 is shown a second member which carries a terminal 3G.

by any suitable means.

This second member is grounded on the frame.' The tirst member extends beyond' the support 3, es shown at 38 and a contact 39 is adjustably carried upon the end of a screw 37 mounted in the free end 38 of this member. On the opposite side of the support 3, a flexible member 40 is attached byscrewstl. l may attach this by any convenient means and support it -from the base This member is attached in such a way that the end 42 ed the slning is free. This end carries a 'contact 43 adapted to coperate with the .contact 39, the two 'forming an electric switch. A portion of the free part of this flexible member is stiit'fened. In the particular tormshown, l fold over the edges oiE the spring as shown at 44, until these edges are substantially at angles to the main part of the spring. This prevents thestitfened portion o f the spring from bending. The support v4 'carries a member 30 similar to the member 30, which is insulated from' said supports lay-insulation 3l and which is fastened thereto by screws 32 insulated therefrom by insulation 33 and bushings (notshown 34 and the free end 33 carries a contact 39 which is mounted upon an adjustable screw 37 mounted upon the support and attached thereto by screws 41. The member 40 carries a contact 43 upon the free exid of the spring and the edges of the spring are folded over at 44. Thecontacts 39 and 43 and the-contacts 39 and `43 are in the nor- The upper This member carries a terminalv carried by the end'38. A spring 40 y30'.

lby aconductor '71 to the conductor 64, but

nial or inoperative position of the instrument, slightly separated. The flexible members pro]ect as. shown at 50, beyond the position of the contact 43. The apparatus is'so .arranged that the vibratory member 20 projects upward between these two members and is so positioned that when vibrated it strikes the extended ends 50 of these members flexing the same so that upon the return of the vibratory member the contacts engage. The natural rate of the frequencies of the parts is such that the vibratory mem- /ber returns and strikes the end 50 of the spring contacts.

The motor contacts are carried by the support 4. 51 is a member carrying the ad- -Jo n justable contact and is very similar in construction and arrangement to the other contoets descrlbed. A iexiblemember similar to that shown at 40 is employed and these contacts are normally in engagement so that the instrument may be started without fiexing the vibratory member with the hand. This member carries an adjustable screw 55 which coperates with a Contact carried by there ring 58.

Re erring now to Fig. 7, I have shown the switch 3943 and the switch 55-58 which controls the motor circuit in the same hori zontal plane in order to get them on the drawing. Normally, these are mounted in the same vertical plane as will be apparent from the' other figures. vIn order to succeed in showing the device in diagrammatic form, it has been necessary to show a special member 20, which represents the reed, but which is shaped very differently therefrom. Thev source of' current is'- shown at B. One pole of this source is grounded at Gr. A con duetor 60 connects one pole to oneside of a switch S. A second conductor 61 connects the other pole to the otherside of the switch. One side of the switch S is connected by a conductor 62 to the motor ,magnet l2. A conductor 63 connects the other side of the motor magnet to the 'contact 55. The contact 58is connected by a conductor 64 to the other side of the switch.. .A conductor G5 leads from theeonductor 62 to one pole of one of the primaries l" of the transformer 'l. The other terminal of this transformer 1s connected by conductor 66, to the Contact carrying;I member 30. Thefiexible member 40 .which carries the contact adaptedv to co operate with a contact carried' by the member30 is connectedv through the conductor 64 to the other side of the switch. One pole of the other primary l" is connected by a conductor 70 to the contact carrying member The Iiexible member' 40 is connected lthe secondary as above described.

the elcctroresponsive devices' Which'aie not hown here.

The operation ot'l my device is as follows: When the switch S is open, the motor contactcarried by 5o and 58 areclosed, the other two .switches being open. When the .switch S is thrown, the motor magnets 'l2 arc energized over the following circuit: ll-Mttl-wonc side of S-ti2-l2--ti35l-5 MMS-Gt and back to battery, thisI txill energize the motor magnets 12 which `will attua-t the armature 24, flexing the vibratory reed :20. interrupting the circuit just described at 555S and pulling back the *bring lll. The break of the circuit will deencrgize the motor magnets, such that'the reed l0 will malte its rectrograde movement. allowingl the spring 5S to engage the contact 55 and the .spring 40 to canse the contact 43 toeugage the contact titl'. The spring 40 will also be flexed. `The closing of switch i35- ltl will complete the following circuit: battery B--G(l-S-6Q(35-Iv--T0-30'e 37-139--t2l-.10'71-(4-Sb1 back to battery B. An impulse of current will flow through this circuit and a current will be induced thereby in the secondary Q. The switch Titi-'5S being again closed, the magnets will again attract the reed causing the same to move forward again. On this forward movement, the circuit through the primary l, just described, 'will be interrupted and the switch 15S- t3 will be closed completing the following circuit through the primary l): battery B-G0--S-GQ 5-P l3l0-tilsl to battery B. Impulses of current flowing through this circuit will induce current in This movement of the reed will again interrupt the motor circuit and the reed will malte its rcctrograde movement, opening the switch 43H32) and permitting the closing ot' the other two. This cycle will bc continued and at eaeh period of vibration each one of the switches will be opened and closed. the parts being so adjusted -that the reed 2O will v1- brate at a natural and ,nwletermined rate. 'lhe current induced in tlie secondary will bc an alternating current of even curve which will be ot' a steady predetermined frequency.

'l turther illustrate the use of this instrument, l will add that a number ot' these in.- struments are associated together'and each adapted to place a current oir'na. particularVA frequency uponand 8l.

lty will be readily secu that I may employ a single motor magnet- 12 to operate my device: that l may support the contacts from the base by other means than those illustrated and that other numerous and extensive departures from the form and details of the apparatus here. shown may he made without depart-ing from the spirit of this inthe line conductors 80 vention, the same being herein shown solely for the purpose of illustrating one specific embodiment thereof.

I claim- 1. In a pole changer, the combination of a base, a Contact supported rigid with said base, a flexible spring attached by a rigid connection with said base, a. contact carried thereby and adapted to engage and disengage said first named Contact, said contacts being normally separated constituting a normally open electrical switch, a vibratory member adapted to engage said flexible spring at each period of vibration to oper ate said switch and a motor magnet controlling said member.

ln a device of the class described, the combination of a base, a holding member removably mounted on said base, a motor magnet removably carried by said holding member, vincluding a magnet core and magnet coil, means for attaching said holding member to said base, a vibratoryl member adapted to be operated by said'motor magports for supporting said sets of contacts from said base, said supports being set inl staggered relation to each other on said base,

a vibratory member mounted on saidbase between said supports and adapted to op erate said contacts when vibrated and a motor magnet for vibrating said ribrutory member.

4. In a pole changer, the combination of' Asaid sets of contacts and a motor magnet for vibrating said member.v

5. In a pole changer, the combiuationiof a base, a contact supported thereby, a second contact supported by said base, said contacts constituting an electric switch, a' 'flexible member carrying said'second contact, means for connecting said member to said base, a part of said flexible member beingfremaportion of the free art of said flexible membembeing stiffene said contact carried on tlustiffencd portion, a, vi'

bratory tuned reed mounted-on said base adapted when vibrated to more A:said second named contact away from the lIirst and a motor magnet to vibrate said reed.

6. In a pole changer, th combinaton'of a base, contact supports on said bas set in staggered relation tay each'othergqwbratory .memberlmounted on 'said base between sai supports"and adapted to operate said con- 1; #actswbell 'vibrated and' a motor (magnet, y. `-f for- :vibratin A said\vibratory member. 7. In la Lpo e chenger, the combination of :'a bas; Contact supported-thereby, a Seci e. vond contact supported by saidbase, sa'idccn- Qtactsconstitutlngan electric switch, a flexible member carrying sind second Contact,

.10 means for, connecting said member to said base, n part 'of Suid lexiblemeniber being ree,' a portion of the free part of said y exible member having its edges turned up ab :in angle to stfen that portion, said Contact carried on saidstiffened portion,` a vibratory tuned reed mountedion Said baise, adapted when vibrated tomove said second named contact away from the' first and a motor magnet to vibrate said, reed.

In testimony whereof, I affix my 'sigm- .ture in the presence of two Witriessea:`

VVitxiesses l F. O.4 Riuniti', A. D. T. Llr. 

